gcc/libjava/classpath/javax/print/StreamPrintServiceFactory.java

/* StreamPrintServiceFactory.java --
   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package javax.print;

import gnu.classpath.ServiceFactory;

import java.io.OutputStream;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;

/**
 * <code>StreamPrintServiceFactory</code> provides a static method to lookup
 * registered factories to construct <code>StreamPrintService</code> instances.
 * <p>
 * <code>StreamPrintService</code> are used to print into a provided output
 * stream in the document format provided by the stream print service
 * implementation.
 * </p><p>
 * Implementations are located and loaded automatically through the SPI JAR
 * file specification. Therefore implementation classes must provide a default
 * constructor for instantiation.
 * </p>
 *
 * @author Wolfgang Baer (WBaer@gmx.de)
 */
public abstract class StreamPrintServiceFactory
{
  /**
   * Default public constructor.
   * Used for automatic loading and instantiation through
   * the SPI jar file specification.
   */
  public StreamPrintServiceFactory()
  {
    // nothing to do
  }

  /**
   * Searches for matching factories providing stream print services that
   * support the printing of documents with the given document flavor into
   * the given output mime type.
   *
   * @param flavor the document flavor needed, <code>null</code> doesn't
   * constrain the lookup result.
   * @param outputMimeType the mime type needed, <code>null</code> doesn't
   * constrain the lookup result.
   *
   * @return The matching <code>StreamPrintServiceFactory</code> instances.
   */
  public static StreamPrintServiceFactory[] lookupStreamPrintServiceFactories(
    DocFlavor flavor, String outputMimeType)
  {
    HashSet set = new HashSet();

    Iterator it =
      ServiceFactory.lookupProviders(StreamPrintServiceFactory.class);

    while (it.hasNext())
      {
        StreamPrintServiceFactory tmp = (StreamPrintServiceFactory) it.next();
        if (tmp.getOutputFormat().equals(outputMimeType)
            && Arrays.asList(tmp.getSupportedDocFlavors()).contains(flavor))
          set.add(tmp);
      }

    StreamPrintServiceFactory[] tmp = new StreamPrintServiceFactory[set.size()];
    return (StreamPrintServiceFactory[]) set.toArray(tmp);
  }

  /**
   * Returns the output format supported by this factory.
   *
   * @return The mime type of the output format as string representation.
   */
  public abstract String getOutputFormat();

  /**
   * Returns the document flavors this factory supports as flavors
   * for the input documents.
   *
   * @return The array of supported document flavors.
   */
  public abstract DocFlavor[] getSupportedDocFlavors();

  /**
   * Constructs a <code>StreamPrintService</code> which directs its output
   * the given output stream.
   *
   * @param out the output stream for the produced document.
   * @return The constructed stream print service.
   */
  public abstract StreamPrintService getPrintService(OutputStream out);
}